JPS6146460U

JPS6146460U - oxygen sensor

Info

Publication number: JPS6146460U
Application number: JP13150584U
Authority: JP
Inventors: 伸秀加藤; 隆生村瀬
Original assignee: 日本碍子株式会社
Priority date: 1984-08-29
Filing date: 1984-08-29
Publication date: 1986-03-28

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of drawings]

第１図は本考案に係る酸素センサの一実施例を示す要部
切欠断面説明図であり、第２図はその■一ｍ断面図であ
る。第３図は第１図の酸素センサの酸素検知素子の保護管体
への組付け操作を説明するための要部分解図である。第４図ａ，ｂは第１図の酸素センサにおけるハウジン
グの取付操作を説明するための要部断面説明図であって
、ａは取付完了前の状態の、またｂは取付完了後の状態
の断面説明図である。第５図は本考案の他の実施例の第４図ｂに相当する図で
ある。FIG. 1 is an explanatory cutaway sectional view of a main part showing an embodiment of an oxygen sensor according to the present invention, and FIG. 2 is a 1-meter sectional view thereof. FIG. 3 is an exploded view of essential parts for explaining the assembly operation of the oxygen sensing element of the oxygen sensor shown in FIG. 1 to the protective tube body. FIGS. 4a and 4b are cross-sectional explanatory views of main parts for explaining the mounting operation of the housing in the oxygen sensor of FIG. 1, where a shows the state before the installation is completed, and b shows the state after the installation is completed. It is a cross-sectional explanatory view. FIG. 5 is a diagram corresponding to FIG. 4b of another embodiment of the present invention.

Claims

[Scope of utility model registration request]

(1) A longitudinal oxygen sensing element with an oxygen sensing portion provided at its tip; the oxygen sensing element is housed inside, inserted into and positioned in a gas to be measured, and exposed to the gas to be measured. a protective tube integrally comprising a protective force bar portion that protects at least a portion of the oxygen sensing element including the oxygen sensing portion, and a protective cylinder portion that covers a portion of the oxygen sensing element that is not exposed to the gas to be measured; a housing for attaching the protective tube to a partition wall that partitions a space in which the gas to be measured exists, the housing being airtightly attached to the outer periphery of a temporary portion in the axial direction of the protective tube; An airtight layer made of inorganic powder is provided between the oxygen sensing element housed in the tube and the inner surface of the protective tube over a predetermined length in the axial direction of the protective tube. ．． oxygen sensor.

(2) The oxygen sensor according to claim 1, wherein the inorganic powder constituting the airtight layer is talc.

(3) The oxygen sensor according to claim 1 or 2, wherein the protective tube body is airtightly attached to the housing via an airtight ring fitted onto the protective tube body. .

(4) The oxygen sensor according to claim 3, wherein the difference in coefficient of thermal expansion between the protective tube body, the airtight ring, and the housing is within 3×10 −6 .

(5) A utility model according to claim 3 or 4, wherein the airtight layer provided within the protective tube is positioned opposite to the airtight ring through the wall of the protective tube. oxygen sensor.

(6) The oxygen sensor according to any one of claims 1 to 5, wherein the airtight layer is provided at two or more positions in the axial direction of the protective tube.

(7) Utility model registration claims 1 to 6, wherein the oxygen sensing element is fixed with an inorganic adhesive such as cement or glass at at least one position within the protective tube. The oxygen sensor according to any one of the above items.

(8) Utility model registration claims 1 to 7, wherein the protective pipe body is a pipe composed of a small diameter part and a large diameter part.
The oxygen sensor according to any of paragraphs.